Here’s an idea - instead of Kylo being all like “Grrr…I’m a bad guy! I want to kill Palpatine and claim his power! Grrr!” What if we could make him into a kind of anti-hero?
For some reason this is always how I saw his character. I never thought he was teaming up with Palpy/Sith for anything. It confused me when people interpreted it that way. Which is why I hate the line “…and take the throne.” He clearly only cares about the fleet in the context of the rest of the movie.
Also, side note, but just about everything you described about Kylo is how I handled things in my novelization.